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151 lines
4.6 KiB
Fortran
151 lines
4.6 KiB
Fortran
!!$
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!!$ Parallel Sparse BLAS version 2.2
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!!$ (C) Copyright 2006/2007/2008
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!!$ Salvatore Filippone University of Rome Tor Vergata
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!!$ Alfredo Buttari University of Rome Tor Vergata
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!!$
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!!$ Redistribution and use in source and binary forms, with or without
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!!$ modification, are permitted provided that the following conditions
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!!$ are met:
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!!$ 1. Redistributions of source code must retain the above copyright
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!!$ notice, this list of conditions and the following disclaimer.
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!!$ 2. Redistributions in binary form must reproduce the above copyright
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!!$ notice, this list of conditions, and the following disclaimer in the
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!!$ documentation and/or other materials provided with the distribution.
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!!$ 3. The name of the PSBLAS group or the names of its contributors may
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!!$ not be used to endorse or promote products derived from this
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!!$ software without specific written permission.
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!!$
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!!$ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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!!$ ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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!!$ TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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!!$ PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
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!!$ BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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!!$ CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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!!$ SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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!!$ INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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!!$ CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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!!$ ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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!!$ POSSIBILITY OF SUCH DAMAGE.
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!!$
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!!$
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!
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! File: psi_crea_ovr_elem.f90
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!
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! Subroutine: psi_crea_ovr_elem
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! Creates the overlap_elem list: for each overlap index, store the index and
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! the number of processes sharing it (minimum: 2). List is ended by -1.
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! See also description in base/modules/psb_desc_type.f90
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!
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! Arguments:
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! ovr_elem(:,:) - integer, allocatable Array containing the output list
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! desc_a - type(psb_desc_type). The communication descriptor.
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! info - integer. return code.
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!
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subroutine psi_crea_ovr_elem(me,desc_overlap,ovr_elem,info)
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use psi_mod, psb_protect_name => psi_crea_ovr_elem
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use psb_realloc_mod
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use psb_error_mod
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use psb_penv_mod
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use psb_serial_mod
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implicit none
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! ...parameter arrays....
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integer, intent(in) :: me, desc_overlap(:)
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integer, allocatable, intent(out) :: ovr_elem(:,:)
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integer, intent(out) :: info
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! ...local scalars...
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integer :: i,pnt_new_elem,ret,j
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integer :: dim_ovr_elem
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integer :: pairtree(2)
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! ...external function...
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integer :: psi_exist_ovr_elem
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external :: psi_exist_ovr_elem
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integer :: nel, ip, ix, iel, insize, err_act, iproc
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integer, allocatable :: telem(:,:)
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character(len=20) :: name
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info = 0
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name='psi_crea_ovr_elem'
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if (allocated(ovr_elem)) then
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dim_ovr_elem = size(ovr_elem,1)
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else
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dim_ovr_elem = 0
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endif
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insize = size(desc_overlap)
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insize = max(1,(insize+1)/2)
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allocate(telem(insize,3),stat=info)
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if (info /= 0) then
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info = 4000
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call psb_errpush(info,name)
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goto 9999
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endif
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i = 1
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nel = 0
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do while (desc_overlap(i) /= -1)
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! ...loop over all procs of desc_overlap list....
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iproc = desc_overlap(i)
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i = i+1
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do j=1,desc_overlap(i)
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nel = nel + 1
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telem(nel,1) = desc_overlap(i+j)
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telem(nel,2) = 1
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telem(nel,3) = iproc
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enddo
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i=i+2*desc_overlap(i)+2
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enddo
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if (nel > 0) then
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call psb_msort(telem(1:nel,1),ix=telem(1:nel,3),flag=psb_sort_keep_idx_)
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iel = telem(1,1)
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telem(1,2) = 2
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telem(1,3) = min(me,telem(1,3))
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ix = 1
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ip = 2
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do
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if (ip > nel) exit
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if (telem(ip,1) == iel) then
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telem(ix,2) = telem(ix,2) + 1
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telem(ix,3) = min(telem(ix,3),telem(ip,3))
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else
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ix = ix + 1
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telem(ix,1) = telem(ip,1)
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iel = telem(ip,1)
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telem(ix,2) = 2
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telem(ix,3) = min(me,telem(ip,3))
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end if
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ip = ip + 1
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end do
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else
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ix = 0
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end if
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nel = ix
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call psb_realloc(nel,3,telem,info)
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call psb_transfer(telem,ovr_elem,info)
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call psb_erractionrestore(err_act)
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return
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9999 continue
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call psb_erractionrestore(err_act)
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if (err_act == psb_act_abort_) then
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call psb_error()
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return
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end if
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return
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end subroutine psi_crea_ovr_elem
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